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"This is hilarious. Also, the voice is very easy to recreate with vocoder, the sound of the voice is very common when you play with this tool.

Viewer of the video

The video then correctly states that NASA sent the Opportunity surface rover to Mars in 2004, but goes onto claim it detected an unnatural signal in 2004.

There is no record of this being the case.

It rightly says that the Curiosity rover was then sent to Mars in 2012, but goes on to claim the ground-based probe picked up the signal and found an alien probe containing the message which has been kept from the public until now.

There is no record of any such discovery.

In a forum dedicated to the alleged discovery on conspiracy website Abovetopsecret.com, in a posting was made at 2.50am today by someone calling themselves Viktor, who claims to have been born in South Africa in 1971.

Viktor claims to have worked in PR and to have met a man who worked for an unnamed company linked to NASA.

Then more holes appear in the story as Viktor says this mystery man, who "died of cancer in 2014," told him the story in 2011, the year before the alleged discovery by the Curiosity Rover.

He said he had worked on the case for five years before deciding to go public.

He said: "For the moment, I disclose the audio files and in few days or weeks, I will update my website and my YouTube channel with others many things."

Scott C Waring, editor of UFO Sightings Daily, whose post suggest any anomaly found in space is proof of alien life forms, was quick to link the alleged recording to an earlier video which alleged to show an "alien probe" floating above the surface of Mars in pictures taken by the Curiosity Rover.

The plot thickens further as Mr Waring describes Viktor as "an anonymous woman he spoke to on Twitter."

GETTY

High frequency: The video has blips and distortion before a computer voice begins

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Mr Waring blogged: "She still has the voice recording of the probe that was found. It's odd for sure, no doubt about that, but NASA doesn't like to tell the public about what they find.

"I went through some old posts and think the probe may be this object below. It's hovering."

The object in question, which YouTube channel Paranormal Crucible claimed had clear shadow beneath it , has been debunked several times as just an optical illusion.

Express.co.uk investigated Thesheivaeproject.com and discovered it was registered as a domain on January 30 this year by a Gatto Vianney, who gave a care of mailing address in Roubaix, northern France.

We were able to contact the website owner through these details and asked for the name of the alleged dead source and about the discrepancies.

A reply from Viktor soon arrived, insisting the recording was real.

He said: "My friend asked me never to disclose his name, I'm sorry, i want to respect my promise."

He said in the 1990s NASA "lost the signal over a short period and the probe has was found out of the original path.

"I work on the research of official documents that talk about this accident, I think I'll have results soon."

He said the mystery friend spoke to him about Voyager in 2011, but did not know about the reply until 2012.

He added: "Disclosure pictures of the probe would be impossible to explain, but the files in the probe, they can make it look like a hoax, it's easy for them (NASA).

"People say I am a liar, so you can imagine what NASA can do against me, but I think people are not stupid."

Viktor also responded to critics on UFOsightingsdaily.com, saying: "We believe that this entity has found a way to understand and respond with what she heard from Voyager."